Bu5hm4nn c650cec159 perf(backtest): reduce Databento API calls on input changes ...

- on_form_change: Only update cost estimate, skip expensive derive_entry_spot
- Only call derive_entry_spot on date changes (start/end inputs)
- Other inputs (template, units, loan, LTV) just mark results stale
- This reduces lag from constant API polling

2026-03-30 20:58:36 +02:00

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